With a fresh new shape and large air vents, The Bell Mach MIPS helmet delivers advanced features and design at an incredible value. First, its rounded, compact profile is a nod to modern road style. While MIPS (Multi-Directional Impact Protection System) is a low friction layer between the shell and the liner which allows the helmet to slide relative to the head in certain crash scenarios. For fit and comfort, Bell's ErgoDial fit system offers a no-fuss solution. For a helmet that's strong and lightweight, the Mach MIPS uses an extended in-mold polycarbonate shell, a method of construction that fuses the helmet's liner with the polycarbonate outer shell. And don't forget there are a total of 18 vents optimized to ensure plenty of fresh, cooling air bathes your head while you're taking on the next or XC adventure. The Bell Mach combines modern road style and performance with cutting edge fit technology. It's a smart choice for all kinds of riders.